I have created quite a few custom appearances in PV360, when you look as some in the selector window, the look correct, however others just appear as black, or gray.

Am I doing something wrong?

In the attachment, the purple plastic looks ok, however, the spray paints do not.

Except for the blue gray textured, these were all just color modifications of the default PV360 appearances. When I apply them to a surface, they look fine, it's just the preview icons that don't. I have a fairly large custom library, and it makes finding the right one sometimes very difficult.

Any suggestions?